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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb056ee3ed89459e94f039da25451d62f3fae7993dace79c87f867c282af5f56' 
  AND token = 'yLybMjirwPSrJ/NbyKtOmTvkN6P56ddg5dRdTvl+oVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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