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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedd123e49c3daecdaf411cd3b89a540279e4485d61590f7c3c83341d42a78c0' 
  AND token = 'hL3T3nhR/ovKsHUyJzqOsjY8s2R2uaNtFD4NNnn4eWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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