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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7ca0d68ceb777e7985e187b780721bc7a1786717daf1bd69b6e9e64cf95fc3' 
  AND token = 'DQit/9igEdR1K/IeuCQISkekVyL3CfkGXsxaUyfCODE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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