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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9856a6ebc59556d4b0a1fa1b537a80e93c2fb6adba0e72631e10bbae63fdaf' 
  AND token = 'Svi6DxcBrBTcIWOvWOA8LpiXcrqfAGkUn+rX3qKPFxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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