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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdeb92fbac34ed716a44bfe8b90ecad34f586d04a79ac7b7661a47fb9802e7c4' 
  AND token = '9WC63ulFYr9zpbgShwgV4jUxHg0WT/RE992PR47UdmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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