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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f3bb6307d242070a53509cc66ae1529c12e7d8f5c6b71501287b7130f91b4c' 
  AND token = 'OqS8aqlwDIgX7WIJn1PnOikIfQpZIq8CS4h93iWlPxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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