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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e320a2fe27cd8a9901dc283a4465ef6d6f3dd5e2c9ed063077fdc325470d1e' 
  AND token = '/zbcuOOROhXCTfg5lDw2k3VgMjxMMD/VQ+yRYxlLEMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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