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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97457866e07f37c3478d04df0009de36d0165fa258defd50a03e2d4d3484633' 
  AND token = 'COgOyT4JZasp3dk6vRwAT+Wyk9iGWRSbo7EvP3zxH2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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