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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c9d48285574c1619271c56ec964b455eed74bf2ab214107b80666ce7ce0c64' 
  AND token = 'jHSbEpZf2I6Osdtrgx2JxdAkSupbOw2yKfrGJeAp5Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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