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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d6a5dd7d323ffb9e7f214ffce0c03ab5fcd42cb78e5cd1669484c57b6c0def' 
  AND token = '60hTVfr02HMFK3GgzWYtEJz3ygsDas12wYe+6e2seFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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