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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea01035bbd183895daf825805f6b2d612484962b0d87e635c99831436179843' 
  AND token = '+MyA5a8QcYBugoek1QJttQD/8KcJrxuyzBunuW1y60c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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