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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7359a89113d90643b497045d7d80112fa2a972948372c06ade16d5eba16f1d' 
  AND token = 'yvYsEEh9QEsmqC1nvOSdXIEa+HqZbxKtr/Ye8fekt08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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