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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae585a262de84d602f16413b4f03e53e01a2131c952abe22a5f4a263ba3e8fc1' 
  AND token = '+XLvBY2NV42IuSR0RAIvc50OQHDk1zvyAIQyaYhKetM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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