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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc035b7c71f758529d2d4e1de6790693a757e89e9f749df60d3a3a89c3f4291' 
  AND token = 'yFpmWhn0NswPz6wcEH81OvqDME6Vny2a1ROCd0PHuRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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