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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe240b8fda5fe7862610a28b03f41296d33337c0bcd7910b6b4015e9fbc5ba1' 
  AND token = '8bkJF3PlsO/44frpACaDzYmrhZcSU7rFcvmgOzOBRJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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