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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f084efb2b131921cd4a0abc9f1b17183397ef03b9f1657a80e3e16adee35c326' 
  AND token = 'Wypn9u504aKfQLhzHRsg4O02/cBgnhuZM1r6v3YZdHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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