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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a73792c213500912619e8d9e557c09b39c9587ae58255e9506dd3a06bcca354' 
  AND token = 'Fvqu0SL2rxT0m8nal9ifiC0qXrNfKEIG2q3fk5ww7/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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