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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6f9f9ee7127ced59ae3db1a745e42adfb7b316a1bb63feefa2436a58f73ce3' 
  AND token = 'JxqFPAiiXT/yNuTiIfc5OZJzz86hryot7zZOWkefgE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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