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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570354cf7cd94461ab6e02fee2adbdf04fdac9b4f8b0dbdb80d76573db7508aa' 
  AND token = '4hzdZ5O97fzHsrqFbs8biP9r+YnQkPUQTOtqWOuJ22E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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