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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b9eb78a5ffb8884f3a147a4a55404da9bffb41a417bdaa3f08169d1f91d878' 
  AND token = 'zw0lHRDeEp6zKwfUYXekTP8TkZB1JVtLqS28TePa2BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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