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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f19a059dad98df3700a7166c15c47d7053aed22b9c09c8ce7cbc8206a68a61a' 
  AND token = '/WNM7v0Iw1pZixz9BOLoZRJpJ29S+LM9EBT/arNX+SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}