SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd97db194d79f5c6bf51093d4db2ea1d78800204cbb2be410ca062d910fd28ce' 
  AND token = 'IixyjJUeU+875rpZBa7MXzTB6G/VZWnsvi3w+BKrn20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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