SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fab2889463aabaae5c7ef6cc931460ef6d6bafce0fec83076ce1c74427299d9' 
  AND token = 'g1Bw1K65jq/EB6R/2Z5MGupM/COZ8PQNCgasRnhhFWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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