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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a95cd05171dead9763d496984da924ae55f3d61cab9950e95142ae025d01da' 
  AND token = 'awPEXdA1sAsMYAzGduNQFr8qZ5ba/8g0dYybQMAauK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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