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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb4133a6e0a17ce24dda188aaa8c382d5e10c85f9327fdf1a14186342819218' 
  AND token = 'G+XKVnLjlsZbjZZRwQ4RcxKjkf4GFk3fIG2rxnkWHuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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