SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cf45cf932b05da251a915204f96d89737f6876a8b2238eb1dd8494e7c7a8c5' 
  AND token = '0sggqFluhZb/r4GPkNoszp3SAaXNrWK0v1qiHQi8knw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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