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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffd82855c6f325f17a42a6d73bfed2e2d56772260bc2e94046b752c7348608e' 
  AND token = 'x/WvPTcGZhqqsRtX3KdnQFuPkEvAX0dPgrIZ41o5j/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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