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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370a844b1a09e60df516250955264b8d999c84a72cdc8ee21880c4c22ec1dab7' 
  AND token = 'Mr6ljtErCePGMxXY+b54g6uVv5Qog6EADvVMBZzq7po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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