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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5d41c49942911efb0158e88dfd2c662a10712dde36897205e5e67d17cb8be4' 
  AND token = '9EuRLYXwSwMEONLiJlzzSNBY9c8L993pgwwI2Qn3Jfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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