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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4f9c56172f4cedd237bef918ba44dcee1391f1c1d247416784ec63333ecd6a' 
  AND token = 'nWws5F7zrRusuqhTCUsOyPy7oz77o2MzrTd6qrrjF58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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