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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86533ee0f6553c7f8d21b761d9c4d7d9f938c878332991f119c6fea9fbf43ce0' 
  AND token = 'MsBn9KXrP59NfWiJ9XO2GjFk3QevMg++hFVY0Eogcd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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