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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ccaaa2cc6fa10238fdd1f7b7de812c10b5e568608b382f7182423017fd8957' 
  AND token = 'S+yr3NHhG73OjYDKhRmrwBo3dyX8QsUX7waEK7S/IJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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