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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0779ae806c6ac3cdb99d7f7f4c93b454f3efa14d011b4dad280ad0ebe07a93' 
  AND token = 'Rjcr6xBKud3IwkOutBkN4HpNd7v4U67Ms62EX+w0Q6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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