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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e29b8eeaf650413ddb134635f1f90d1da89caedc66e66a8ef16bd370afc659' 
  AND token = 'Mxh7O7iKp4mx5ija7hGMFqnR0wCM8ASrbiab61gcxvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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