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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d413653763a348fb7c05d63bffc9a58147f1e4390e5abf7a8c9c0bb4c6b24e' 
  AND token = 'aN0Nf5wO9fnZtPnkWdO2BbLXtQatHunjgmE18ogMtLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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