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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e91747357f901eec2ffa0d4c1c60860c252681eb7d9f7b0ba745e96a7dc07c' 
  AND token = 'RAwdw0hTly96FhggGsx2An+dg2d8PLZotgawgQ14m5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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