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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce0fccf9a032a65677a15303d68bab7dddeec8268f4dab04ff68c68ffcd2dd5' 
  AND token = 'VoZ8AR6l5NkyuqmAybnkVrWAvA4FS3PHC7yDX108fC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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