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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af79eb766068672e6c625e5e996d2c0535f0f3159fe43d63b82a902e2553c719' 
  AND token = 'COmKwsy2wXGtD9Se9jLIYHIPjzJA8J1rFEJdia0l9w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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