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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941ca284629aa0b66728d0df25683dd23d8237d5d79cca8a08c0f61c0acb68ba' 
  AND token = 'O8KRG1RqHU56Z/H8Z1kK7OeLZEaZirJUxGp+VyoBqy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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