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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9594b7ee0ee76d73f8c2dc3214666c0a8f506ffc2ed90c94a1f6588eefc4af99' 
  AND token = 'dbk1VRP9A7Xu3SvitblTnA5Kj+7Ero7U0igxks6FuqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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