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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a4ec32c964b83dda97e3e391e2872c4f372621d38e0a70fff67a85dd96eb3d' 
  AND token = 'ElvQk9V27laxxwtkzMSkIObhP8Z6OV6BmbXiG0nBA3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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