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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de26684f84438bf62e6072aa22029fb3170c97ac24b145a1911649cb0d33649' 
  AND token = 'Ud0rMWmOUBR/HGqPseoZ53uLxkY0PM90KXeaWrhoDx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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