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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6405f478fa1803a789c625a23b9fc765c917f7cd92650e1078773af1e3c2ef2a' 
  AND token = 'J4HhdS2TFCWD5UNwiN/mhxQ6jgMAswbIM9eZQ/xik78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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