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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40580024551e5edb3587a9f83d728db0a203f9603992438ba510fb99fc59bf00' 
  AND token = 'vmUk6OEHX+FXPqJYP7/+GamyEKFHaxd+ZI7O5K6AvS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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