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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c101fdc9348244f5514506a6b1ca448b655aba7af32284eb5bfd0db6df805437' 
  AND token = 'wRo2z4FHld6oB/1bO6wc8tqvAmiaAsZwl5FtlZQdNvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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