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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc788359003f3231a484e3225ec6ad5f8fdfb0f0a12eb1afeea02d3a2a46a50f' 
  AND token = 'MFempAQfW+7Z2elTfP4eZ3l9W921Nac0NBn/vFXaopI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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