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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f964520ff330c51b0a306fcb5b8d5d085f4e1037e09affe99aba592c72938f' 
  AND token = '3Bapi/D2MDxZMg5gf8UiQ6jbsl+27kZqO/PRxuh+LI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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