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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a1ddf22bf3dc7f2637e20fe5f80865506c38cf5ba3e583ff8c42b41bcf0ccf' 
  AND token = 'WJYzb+m3MkSjbrvTSbMWSiWqEeoS3j4gIxB/WSRYlCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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