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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f305eb10cf066c5a74e1922eba7c407cd6830350f6370b648b5a450bb8b61368' 
  AND token = 'Ef0yOWST+7QzhFZumv+O6Px83qrGUDo3HwrxIWbXU50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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