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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3f5cc91709d29c9162df0ac5f796884fe6dccc66dbe9142e0c0ee70a615032' 
  AND token = 'GegnlTfz0G4c1SYbhs8/sAzoLNeaWEf5gv7/v8RoFiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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