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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192092ee85bada1b8ac775fd1b8d8058ff37172ebde5ee8a6b3e0bdd3c9e5564' 
  AND token = 'hq+xdj13dQE2fSdd441AnrLqWt87WxRE3cuyIKkSrkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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