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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8348e7e66e1cb7da05380307c5a01cb3733d8f1e75c63ecae64bd350b942ba42' 
  AND token = 'N5stsgSUvL840p20SoZ0ufcRDKUUa5DqcECbqOn186g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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