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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adda21e5cdcc5542627b1ffb03ba583d2957a1c10bef34ffe269cb082143cb10' 
  AND token = 'Yf/PDY0Aac697b4hAKA2vLRVGaTE49n7WQ8l8iZPiTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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