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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38af61df696762296a18d2332265c7b761cef3109ba9f1abca23518617fc4009' 
  AND token = '/Spl00KKTHyTDe4dZ67EtrkiH/hOjF0Pz3E1rmMf3+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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