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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c059e3cc26527ad87e1c259a4b48bfa96c3a086dd78963bb88d1589e3e7882da' 
  AND token = 'vwzJAdE15KPxxHhDJqJzIYKyAcbc4foX85G+aTBtHwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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