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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e3dcf1b639d08209c74e8d144e94978391b955a290ee89858456c3e11c142a' 
  AND token = 'RUhSYAo0gV4fPNyL04Ae3pHN2jWvszIYKBkYE44muHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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