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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea5d6c01eeb97732a368406aa3a02f8105e7e068cc2e1337645ebbf4c316f4c' 
  AND token = 'mqY7CvJTpfu/Q0+sjZSe2buRSkESs672WHk7t5+4aCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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