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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8104161d2803a2392ea0b0dff793128cf79b28f7e54ae8f3340338e1d07c6913' 
  AND token = 'celfZsd9oIaXpRq7vjq3yOXBZSbxENhzItq0kZgW/JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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