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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8daf803f13fcd36d2f9785c9174857a5677ee3fc779fa82fcfa95916f753f2e' 
  AND token = 'DWkNs4Al36jH7UPBxICqh2B/9VuLHSG2P42WmKAwQ0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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