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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9d4c0cea8f5f342a7dd53ce5d7fa99c8c301c9bac6cd7dbaf49a5fed4d4029' 
  AND token = 'ClRoJi4ayx95sHJvBUXeuTVk7YeG7khMvz+55KADmbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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