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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb40ab4958a0e4ecabba9d3dd911a467df2f16351cb1c3f3f9245b9fa2b7715b' 
  AND token = 'IKzszrGuU9vFudFp+H2xaBe+oLwfc/cou300+Kk/flA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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