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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0ad173bb0272fb273e655ba87ab2673aa744f723cd730179e8626100f8ba80' 
  AND token = '6mohKFcZnELSQg5J6FQi/wFWSwtAA9ta7lkJzXCSTjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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