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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ec05eacf6ebe4a85506e0c03be8d7c6277148e9bf078e008721e575f199494' 
  AND token = 'OPenuK9TC1WKKa8fkLFamy0p4Sb46h1GZaQKNw0M9QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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