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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c32c4b620cc3b0140f0731cedd8635769cd42ab338b6966cae343c48af8655' 
  AND token = 'KLJJSK3zCAVG7vEMFpkfKuADLEZ2LGluVwN7Is/2w78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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